Valve adjustment on the 4AFE must be done cold. There are 24 different shims available. If they used the largest shim and it still was not in spec, they should have told you the cam/bearing caps needed to be replaced.
There is s special tool you would need (Kent-Moore J-37141-A) to adjust the valves. You remove the cam cover, insert one of the tools (it is a set) to compress the valve spring, use the other tool to hold it and then replace the shim.
The problem sounds like they adjusted them hot and when it cooled down the adjustment was off.
I would have them do it until they get it right (without charging you).
Friday, November 2nd, 2007 AT 6:19 AM